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1. The company's email gateway is down for maintenance.
公司的电子邮件网关正在维护中。
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2. The new email gateway has improved the user experience significantly.
新的电子邮件网关极大地提高了用户体验。
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3. The email gateway is a crucial component of our online communication system.
电子邮件网关是我们在线通信系统的关键组成部分。